Yes, I got it , I appreciate your assistance , I will wait sometime , May be I can get the extension before 17th March ( expire date) then applying online for my sons permit , I didn't apply with me because the work permit takes 144 days while study permit takes 25 days , Of course their visas would be refused as I didn't submit my approval extension, Sometimes wondering who is the genius who set these rules ???? Of course it is common issue , they are delaying everything for not logic reasons , Why should we wait 144 days to get the extension while having AOR , it is about 5 months to get the approval then applying for our family .
Anyway I thank you so much for the useful information